Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 2205

December 25, 201216 parishes in Louisiana; 44 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 25, 2012, 5:56 AM CST for 16 parishes in Louisiana; 44 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Dec 25, 2012, 5:56 AM CST (11:56 UTC)
Expired: Dec 25, 2012, 7:30 AM CST
In force: 94 min
Issued by: the Storm Prediction Center

All 60 counties

Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Vernon Parish, LA, Anderson County, TX, Angelina County, TX, Bell County, TX, Bosque County, TX, Brazos County, TX, Burleson County, TX, Cherokee County, TX, Coryell County, TX, Ellis County, TX, Falls County, TX, Freestone County, TX, Grimes County, TX, Hardin County, TX, Henderson County, TX, Hill County, TX, Houston County, TX, Jasper County, TX, Lee County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Montgomery County, TX, Nacogdoches County, TX, Navarro County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Tyler County, TX, Van Zandt County, TX, Walker County, TX, Washington County, TX, Williamson County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 11.9 hours before the alert went out and 183 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 299 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 25, 1:01 AM CST	Mesoscale Discussion	SPC	Allen, Beauregard, Sabine, Vernon	59 min
Dec 25, 1:37 AM CST	Severe Thunderstorm Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, De Soto and 9 more	7 hr
Dec 25, 7:00 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Beauregard, Calcasieu and 24 more	60 min
Dec 25, 7:28 AM CST	Tornado Watch	SPC	Acadia, Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia and 19 more	6 hr
Dec 25, 8:46 AM CST	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Bienville, Calcasieu, Caldwell and 21 more	59 min
Dec 25, 9:02 AM CST	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 20 more	7 hr
Dec 25, 9:17 AM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more	8 hr
Dec 25, 12:19 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 35 more	71 min
Dec 25, 12:23 PM CST	Mesoscale Discussion	SPC	Bienville, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 13 more	67 min
Dec 25, 12:58 PM CST	Tornado Watch PDS	SPC	Ascension, Assumption, Catahoula, Concordia, East Baton Rouge, East Feliciana and 20 more	9 hr
Dec 25, 3:22 PM CST	Mesoscale Discussion	SPC	Caldwell, East Carroll, Morehouse, Richland, West Carroll	53 min
Dec 25, 3:44 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more	91 min
Dec 25, 9:31 AM CST	Mesoscale Discussion	SPC	Archer, Baylor, Clay, Cooke, Denton, Hood and 10 more	5 hr
Dec 25, 11:02 AM CST	Mesoscale Discussion	SPC	Wichita, Wilbarger	4 hr
Dec 25, 1:00 PM CST	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Collin, Dallas, Delta and 16 more	5 hr
Dec 25, 2:50 PM CST	Mesoscale Discussion	SPC	Clay, Wichita, Wilbarger	4 hr

Nearby

Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in Louisiana, 2012 Every mesoscale discussion in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.